Also interesting ring was found by my friend. This is RPI (Riga Polytechnic Institute) Faculty of Power ring for students. Found in capitulation positions.

post-90188-0-47124400-1452012271.jpg (18.17 KB, 169 downloads)
post-90188-0-99661500-1452012276.jpg (20.82 KB, 169 downloads)
post-90188-0-13890800-1452012407.jpg (65.49 KB, 169 downloads)
post-90188-0-27985300-1452012416.jpg (49.26 KB, 169 downloads)